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CVE-2026-13039— Eventin 4.0.26 - 4.1.15 - Missing Authorization to Unauthenticated Payment Bypass via REST API

Quick assessment

Affected
arraytics Eventin – Event Calendar, Event Registration, Tickets & Booking (AI Powered)
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress Eventin是WordPress基金会的一系列CMS组件。 WordPress Eventin 4.0.26版本至4.1.15版本存在授权问题漏洞，该漏洞源于PaymentController.php中的payment_complete()函数未正确验证用户授权，导致未经身份验证的攻击者通过提交伪造的SureCart checkout ID或FluentCart cart hash，可将未支付的票务订单标记为已完成，从而获得付费活动访问权限、QR码参与票和订单确认邮件，而无需进行实际

CVSS 5.3 · Medium EPSS 0.35% · P27

Affected Version Matrix 1

VendorProduct Version RangeStatus
arraytics Eventin – Event Calendar, Event Registration, Tickets & Booking (AI Powered) 4.0.26≤ 4.1.15 affected
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I. Basic Information for CVE-2026-13039

Vulnerability Information
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Vulnerability Title
Eventin 4.0.26 - 4.1.15 - Missing Authorization to Unauthenticated Payment Bypass via REST API
Source: CVE Program / CVE List V5
Vulnerability Description
The Eventin – Event Calendar, Event Registration, Tickets & Booking (AI Powered) plugin for WordPress is vulnerable to authorization bypass due to a regression in versions from 4.0.26 up to and including 4.1.15. This is due to the plugin not properly verifying that a user is authorized to perform an action in the payment_complete() function of PaymentController.php. This makes it possible for unauthenticated attackers to mark unpaid ticket orders as completed by submitting a fabricated SureCart checkout ID or FluentCart cart hash, granting themselves paid event access, QR-code attendee tickets, and order confirmation emails without making any real payment. The wp_rest nonce required to reach the vulnerable endpoint is embedded in every public event page, meaning no WordPress session or credentials are needed to obtain it. This vulnerability represents a regression — the same function and endpoint were previously patched but the fix did not persist through subsequent releases.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress Eventin 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Eventin是WordPress基金会的一系列CMS组件。 WordPress Eventin 4.0.26版本至4.1.15版本存在授权问题漏洞，该漏洞源于PaymentController.php中的payment_complete()函数未正确验证用户授权，导致未经身份验证的攻击者通过提交伪造的SureCart checkout ID或FluentCart cart hash，可将未支付的票务订单标记为已完成，从而获得付费活动访问权限、QR码参与票和订单确认邮件，而无需进行实际
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
arraytics Eventin – Event Calendar, Event Registration, Tickets & Booking (AI Powered) 4.0.26 ~ 4.1.15 -

II. Public POCs for CVE-2026-13039

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III. Intelligence Information for CVE-2026-13039

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Patches & Fixes for CVE-2026-13039 (1)

Security Blog Posts for CVE-2026-13039 (1)

Same Patch Batch · arraytics · 2026-07-10 · 3 CVEs total

CVE-2026-12924 6.4 MEDIUM Eventin <= 4.1.15 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'etn_faq_
CVE-2026-11818 5.4 MEDIUM WPCafe <= 3.0.14 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Modifica

IV. Related Vulnerabilities

Same product: Eventin – Event Calendar, Event Registration, Tickets & Booking (AI Powered)
Same vendor: arraytics
Same weakness: CWE-862

V. Comments for CVE-2026-13039

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